Hanna GroLine HI98331 Direct Soil EC Tester | Penetration Probe Air Filters + Odor Control The extensive range of products

The extensive range of products and sizes available in the Grodan line provides growers with more options

Its printed dot reads red while there is work left

Underneath the designation the fill is the ordinary Integra blend of plant-based glycerin and water

The compact bar form factor integrates seamlessly into the ROI-E720 frame without adding significant weight or blocking primary light output

It is built with dual o-ring fittings and a steel pressure gauge

Hanna GroLine HI98331 Direct Soil EC Tester | Penetration Probe Air Filters + Odor Control The extensive range of productsWhat a Direct Soil EC Meter Saves You The old routine was a slurry. Take a sample, mix it with distilled water at a set ratio, wait, filter, then read the extract. It works, and it takes long enough that most people skip it. The HI98331 puts a stainless steel penetration probe into the substrate and reads it where it sits. Range runs 0 to 4000 uS cm, resolution 1 uS cm. One button, one point calibration, done automatically against a 1413 uS cm